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Related Concept Videos

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Relaxation effects in low density amorphous ice: two distinct structural states observed by neutron diffraction.

K Winkel1, D T Bowron, T Loerting

  • 1Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria.

The Journal of Chemical Physics
|June 3, 2009
PubMed
Summary

Investigating amorphous ices using neutron diffraction revealed distinct structures in low-density amorphous ice (LDA) samples. These structural differences, linked to water network ordering, impact compression behavior and indicate separate energy landscape basins.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Amorphous ices exist in various forms, including low-density amorphous ice (LDA).
  • Understanding the structural nuances of LDA is crucial for comprehending water's complex phase behavior.

Purpose of the Study:

  • To investigate the structural differences between two distinct LDA samples.
  • To correlate these structural variations with their formation pathways and compression behaviors.

Main Methods:

  • Neutron diffraction with hydrogen/deuterium (H/D) isotopic substitution.
  • Preparation of LDA from high-density amorphous ice (HDA) and very high-density amorphous ice (VHDA).
  • Atomistic modeling to interpret structural findings.

Main Results:

  • Distinct scattering patterns were observed for the two LDA samples, indicating structural differences.
  • These differences correlate with perturbations in the hydrogen-bonded water network on intermediate length scales.
  • Atomistic modeling suggests a balance between short- and intermediate-range order/disorder in the LDA structures.

Conclusions:

  • The structural differences in LDA samples are evident in their compression behavior.
  • These findings imply the existence of distinct structural states (basins) within the LDA energy landscape, even at identical densities.